Wireless Power Feeder Thermal Sensing for Foreign Object Overheating

The patent applies preliminary action by placing a temperature sensor on the charging base surface before actual charging occurs. This allows the system to detect temperature changes at the earliest stage (at the base surface) rather than waiting for the coil temperature to rise and then measuring it. The sensor detects temperature changes caused by metal foreign objects or abnormal heating before they propagate to the coil, enabling earlier intervention and faster response time.

The patent uses the charging base surface as an intermediary to detect temperature changes. Instead of directly measuring coil temperature (which has delay), the system measures temperature at the base surface that is thermally coupled to the coil. This intermediary measurement point provides earlier and more accurate detection of abnormal temperature rises, improving both response time and detection accuracy.

The patent implements periodic temperature monitoring at predetermined time intervals during the charging process. Instead of continuous monitoring that would consume excessive energy, the system checks temperature at specific intervals (e.g., every few seconds). This periodic approach maintains adequate safety monitoring while significantly reducing energy consumption compared to continuous measurement.

The temperature sensor on the charging base surface passively detects temperature changes caused by metal foreign objects or abnormal heating without requiring active heating or complex measurement systems. The system uses the natural thermal field and the sensor's inherent detection capability, minimizing additional energy consumption while maintaining safety.